1. Theory of Mathematical Structures;Adámek,1983
2. Iterated cotriples;Appelgate,1969
3. Monade idempotente associée á une monade;Fakir;C.R. Acad. Sci. Paris Sér.,1970
4. Essentially algebraic categories;Herrlich;Quaestiones Math.,1986
5. Category Theory;Herrlich,1979